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Kou created songs and uploads them to the Internet, and Yuka and Saki enjoy his music as fans, always listening with deep interest and admiration. Their final summer vacation has begun as junior high school students.
A mysterious disease spreads around the world. If people get the disease, cherry blossoms will bloom on their body and they will die. The cause or possible vaccine for the disease does not exist. People begin to accept the disease as part of their daily lives.
